My b2evolution Version: Not Entered

I am in need of some quantum blog theory here .

this is a piggy back to post:

http://forums.b2evolution.net/...hp?t=11577

i am attempting to put a custom banner on each site, but

- the .css doesn't cut it, because i want it to show up when printed, and be clickable ...not a background image
- altering the _main.php changes all my blogs
- i was hoping to avoid a separate skin for each blog (i have 30 now and will have 100 shortly..lots of file maintenance).

my only thought is there must be a way to pull a dynamic file name based on the blog id (if i named all the image files to correspond with the blog name) in _main.php and placed them in each media directory or dumped all the banners in the same 'custom' skin folder.

an example site is http://knng.varsitysportsradio.com

_main.php below:
-------------------------------------------------------------------
<div class="pageHeader">
<!--this is the area for google ads to go above the banner-->

<!--OLD CODE
<h1 id="pageTitle"><a href="<?php $Blog->disp( 'url', 'raw' ) ?>"><?php $Blog->disp( 'name', 'htmlbody' ) ?></a></h1>

<div class="pageSubtitle"><?php $Blog->disp( 'tagline', 'htmlbody' ) ?></div>
-->

<a href="<?php $Blog->disp( 'url', 'raw' ) ?>"><img src="img/knng_banner.jpg" alt="KNNG"></a>
</div>

there has to be a way to make the 'name'_banner.jpg be variable but my coding hasn't cut the mustard yet